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27 Water MCQ1

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Questions and Answers

What is the primary method of removing temporary hardness from water?

Filtration
Deionisation
Ion exchange
Boiling (correct)

What is the purpose of chlorination in water treatment?

Killing pathogenic bacteria (correct)
pH adjustment
Removal of permanent hardness
Removing suspended solids

What is the primary function of sedimentation in water treatment?

Killing bacteria
pH adjustment
Removing suspended solids (correct)
Removing permanent hardness

What is the result of adding lime (Ca(OH)2) to acidic water?

It increases the pH of water (D) Signup and view all the answers

What is the primary method of removing permanent hardness from water?

Ion exchange (B) Signup and view all the answers

What is flocculation in the context of water treatment?

The coming together of small suspended solids (B) Signup and view all the answers

What is the primary goal of flouridation in water treatment?

Strengthening teeth and preventing decay (A) Signup and view all the answers

What is the purpose of deionisation in water treatment?

Removing ions from water (D) Signup and view all the answers

What is the reaction that occurs when boiling is used to remove temporary hardness from water?

Decomposition of calcium hydrogencarbonate (C) Signup and view all the answers

What is the purpose of adding sulphuric acid in pH adjustment?

To lower the pH of basic water (D) Signup and view all the answers

What is the type of hardness that can be removed by methods other than boiling?

Permanent hardness (A) Signup and view all the answers

What is the ion exchanged with Ca²⁺ or Mg²⁺ ions in ion exchange method?

Na⁺ ions (B) Signup and view all the answers

What is the type of hardness that can be removed by boiling?

Temporary hardness (B) Signup and view all the answers